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Reference discussion [post](https://forum.vac.dev/t/sybil-and-dos-spam-protection-for-libp2p-mix/598). This PR includes sections for spam protecting a mixnet deployment using mix protocol and how spam protection mechansims are pluggable in nature. It lists down requirements of a spam protection mechanism and suggests two integration methods for any mechanism with various trade-offs. - [x] Add spam protection mechanism architecture - [x] Suggest various approaches possible with trade-offs - [x] Detail how each approach would be integrated into sphinx packet and changes to it - [x] Include node responsibilities - [x] Interface definition for spam protection implementations